How do I find my Apple Card account number?

This support article explains how to find your account numbers,

How to find the card numbers associated with your Apple Card - Apple Support

There are however, 3 sets of numbers and you have limited access to the other sets of account numbers. This article explains the various sets of numbers,

https://www.businessinsider.com/apple-card-titanium-different-number-apple-pay-2019-8